Adhesive lacquer or varnish composition



Patented Au 16, 1927;

a NI ED STATES PATENT OFFICE.

CHARLES R. BRAGDON, or crnornnn'rr, 01110, ASSIGNOB To 'rnnnon'r & WIBORG cournmz; on CINCINNATI, onro, a conronn'rron or OHIO.

nmansrvn nncounn on vnnmsn oomrosrrron.

1N0 Drawing.

This invention relatesjto a novel adhesive lacquer or varnish composit on and consists of the matters hereinafter described and plied and clamped to the tops of bottles and jars for sealing them. Within each of said caps is contained a cork or other resilient sealing disc which directly engages the top lip of the bottle or far in such manner as to ovide an hermetlcal sealto prevent contamination of the contents. Such discs are preferably cemented -to the'inside faces of thecaps by an adhesive compound, and the lacquer or varnish described herein is designed to act as such. adhesive.

Crowns or caps of the kind are generally stamped and formed from thin metal sheets,-a large number of such caps being cut from a single sheet. The disc of cork or other resilient material which is to provide. the seal, is then cemented by' some adhesive compound within .the cap. Several kinds of cementing compound have been used,

among them being-one based on egg albumen and others consisting of resins dissolved in alcohol. Most of these compounds are applied-in liquid form by means of a dropper to the finished caps individually when the sealing disc is inserted into the cap.

The application of such adhesive compounds applied in this manner is tedious and time-consuming and adds considerably to the expense of manufacture of the crowns or caps. In addition, adhesive compounds applied in this wayare not very eflicient in maintaining the adhesion of the disc to the cap.

The object of my invention is to provide an improved adhesive lacquer or varnish, which may be applied in a single operation by a coating machine to one side of the metal sheet from which the crowns or caps are' 'to be'stamped, so that the adhesive is. al-

ready on the inside of the caps when they are formed. The step of separately applyin th reby eliminated and the cost of manufacture of the crowns or caps greatly reduced In addition, the novel lacquer or adhesive cement to each cap or crown is.

Applicationflled January 16, 1926. Serial No. 81 ,771.

- varnish provides a more efficient and permanent adhesion of the disc to the cap.

My improved lacquer or varnish, after it is applied to the flat metal sheet by the coatmg machine, is dried, preferably by baking the sheet in an oven at a temperature of from 180 to 250 F., wherein it is allowed to remain from twenty minutes to halfan hour. lVhen the sheets are removed from. the .oven', the may then be piled one upon the other wit out danger of the sheets sticking' together.

- 'After the sheets have'be'en passed through the die stamping machines, the formed crowns or caps are then passed through assembling machines, in which each cap has inserted into it aicork or other sealing disc. The caps or crowns are next passed over small gas flames or other source of heat for a few secondsto soften the lacquer or var nish. They are then subjected to pressure between plungers which hold thesealing discs against the inner surfaces of the crowns or caps until they are'cooled. This finishesthe operations,-the sealing discs beingthen firmly cemented to the crowns or caps.

from which the caps are made, as above outlined, it is evident that two apparently opposed requirements are. to be met With a 5 varnish adhesive of the kind. The varnish must not be so tacky or sticky after application, baking and cooling, that it will cause the metal sheets to stick together when piled oneupon the other. Upon the other hand, it must have' suflicient adhesive quality to efliciently and permanently hold the sealing'disc to the cap without danger of the disc becoming detached from the cap.

These apparently" opposed characteristics are to be found-in the improved lacquer or varnish composition herein described.

In addition said composition possesses the required properties for satisfactory applicat on by means of a coating machine. and

is free from any ingredients that might contaminate the contents of the bottles or 'ars to which the crowns or caps are applie in case the said contents should penetrate the sealing disc and come in contact with the 9 lacquer or'varnish. 7

My improved lacquer or varnish composit1on consists of a mixture of =(1") a comith the method bf handling the sheets bination of varnish resins, hard copal resin or gum and' rosin or colophony; '(2) asphaltum or pitch; (3) a combination of drying and semi-drying oils; (4:) a small amount of calcium hydrate; and a small amount of resinate of manganese. The mixture. of

these elements constitutes the body of the composition,that is tosay', the part which remains on the metal sheet after the sheet has been baked. This mixture is made -into liquid form capable of application by a coating machine by the addition of (6) f mineral s irits such as naphtha or turpentine substitute, with which it is thoroughly intermixed.

In preparing the lacquer or varnish coinposition, I prefer to use the ingredients in about the following proportions:--(1) 427 lbs. of varnish resins consisting of 300 lbs. of wood rosin and 127 lbs. of Congocopal gum; (2) 17 lbs. of gilsonite asphaltum;

323 lbs. of drying and semi-drying oils,

asphaltum; (3) 320 lbs. of drying and semidrying oils, comprised of 220 lbs. of heavy-' bodied linseed oil, 80 lbs. of prepared tung oil, lOlbs. of Menhaden oil; 10 lbs. of soya .bean oil; (4) 2 lbs. calcium hydrate; and

(5) 4 lb. of resinate of manganese- With this is mixed (6) 600 lbs. of mineral spirits (naphtha and turpentine substitute).

The above two examples illustrate the manner in which the proportions of the ingredients of the composition may be varied. The gilsonite asphaltum or pitch will vary according to the color desired in the lacquer or varnish. These may be referred to as bitumen or binuminous material, a term intended to include either pitch or gilsonite, when used in the claims. The rosin may be derived from either scraping of the pine tree so-called gum rosin or from extraction from the wood itself or wood rosin.

Good results may be obtained wherein the ingredients are varied within the following limitations,that is to say (1) from 250 to 450 lbs. of varnish resins of which 120 to 130 lbs. is hard copal resin, the balance being wood rosin; (2) from 15 to 35 lbs. of gilsonite asphaltum (asphaltum or pitch) (3) from 300 to 350 lbs. of drying and semi-drying oils of which 220 to 240 lbs. may be heavy-bodied preparedlinseed oil, 75 to 80 lbs. of prepared tung oil, and the balance Menhaden and soya bean oils, in substantially like amounts; (4) from 2 to 3 lbs. of calcium hydrate; and"(5) from semi-drying oils; calcium hydrate; resinate of manganese; and a bituminous coloring material.

2. A lacquer or varnish composition which is non-adhesive at ordinary temperatures after baking, but whichwill become strongly adhesiye when subsequently heated, which includes a mixture of varnish resins, consisting of copal resin and rosin; drying and semi-drying oils; calcium hydrate; .'and resinate of manganese.

3. A lacquer or varnish composition which is non-adhesive at ordinary temperatures after baking, but which will become strongly adhesive when subsequently heated, which includes a mixture of varnish resins, consistin of copal resin and rosin; drying and semirying oils; calcium hydrate; resinate of manganese; and a bituminous coloring material ;the mixture being reduced to liquid form by the addition of mineral spirits.

4. A lacquer or varnish composition which is non-adhesive (at ordinary temperatures after baking, but which will become strongly adhesive when subsequently heated, which includes a mixture of varnish resins, consisting of copal resin and rosin; drying and semi-drying oils; calcium hydrate; and a resinate of manganese ;the mixture being reduced to liquid form by the addition of mineral spirits.

5. A lacquer or varnish composition which is non-adhesive at ordinary temperatures after baking, but which will become strongly adhesive when subsequently heated, which includes .a mixture of varnish resins, consisting of copal resin and rosin; drying and semi-drying oils; calcium hydrate; resinate of manganese; and a bituminous coloring material,substantially in the proportions as described, the mixture being reduced to liquid form by the addition of mineral spirits.

6. A varnish or lacquer composition including a mixture of from 250 to 450 lbs. of varnish resins of which 120 to 130 lbs. is hard copal resin, the balance being wood rosin; from 15 to 35 lbs. e fgilsonite asphaltum; from 300 to 350 lbs. of drying and semi-drying oils of which. 220 to 240 lbs. are

' heavy-bodied prepared linseed oil, 75'to -80 lbs. are prepared tung oil, and the balance,v

Menhadfin and soya bean oils, in substantially like amounts; from 2 to 3 lbs. of'ealcium hydrate; and from to 1 lb. of resinate of manganese. I

'7. A varnish or lacquer composition including a mixture of from 250 to 450 lbs. of varnish resins of which 120 to 130 lbs. are hard copal resin, the balance being Wood rosin; from 15 to lbs. of gilsonite asphaltum; from 300 to 350 lbs. of drying and semi-drying oils of which 220 to 2&0 lbs. are heavy-bodied prepared linseed oil, to lbs. are prepared tung oil and the balance, Menhaden and soya bean oils, in substantially. like amounts; from 2 to 3 lbs. of calcium hydrate; and from to 1 lb. of resinate of m'anganese,the mixture being reduced to liquid form by the addition of 550 to 600 lbs. of mineral spirits.

8. A varnish or lacquer composition including a mixture of 427 lbs. of Varnish resins consisting of 300 lbs. of Wood rosin and 127 lbs. of Congo copal gum; 17 lbs.

of gilsonite asphaltum; 323 lbs. of drying and semi-drying oils, comprised of 237 lbs.

of heavy-bodied prepared linseed oil, 76 lbs.

of prepared tung oil, 5 lbs. of Menhaden oil and 5 lbs. of soya bean oil; 3 lbs. of calcium hydrate; and 4 lb. of resinate of manganese,

'tlie mixture being reduced to liquid formby the addition of mineral spirits.

9'. A varnish or lacquer composition including a mixture of from 250 to 450 lbs of 1 varnish resins of which to lbs. is hard eopal resin, the balance being Wood rosin; from 300 to 350 lbs. of drying and semi-drying oils of Whieh220 to 240 lbs. are

heavy-bodied prepared linseed oil; 75 to 80 lbs. are prepared tung oil, and the bal- CHARLES RJBRAGDON. 

